2. Use MATLAB to determine the following functions: \text { a. } f\left(8 x^{3}+4\right) d x \text { b. } \int 4 \cos (2-3 t) d t \text { c. } f\left(4 t^{3}-9 t^{2}+7 t+3\right) e^{-t} d t \text { d. } \int_{2}^{3}\left(6 x^{3}-2 x^{2}+3\right) d x